Regex Builder + Live Tester
Switch between visual builder mode or raw editor. Matches highlight instantly with capture group details. Runs fully in your browser.
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Regex FAQ
What is a regex? ＋
A regex (short for “regular expression”) is a sequence of characters that defines a search pattern. It is commonly used for string matching, validation, and text extraction.
How do I test a regex online? ＋
You can paste your text and pattern into the Regex Playground above. Matches will highlight instantly, and capture groups are displayed for easy debugging.
What are regex flags? ＋
Flags modify how regex behaves. For example: g finds all matches, i ignores case, m treats input as multi-line, and s makes the dot match newlines.
Can I learn regex without coding? ＋
Yes! With the Regex Builder, you can construct regex visually without typing syntax. It’s a good way to learn patterns step by step.